1N935BUR-1 – 1N938BUR-1
CDLL935 – CDLL938B
Temperature Compensated
Zener Reference Diodes
Qualified per MIL-PRF-19500/156
DESCRIPTION
The popular 1N935BUR-1 through 1N938BUR-1 series of Zero-TC (Temperature
Compensated) reference diodes provides a selection of 9.0 V nominal voltages and
temperature coefficients to as low as 0.001 %/
o
C for minimal voltage change with temperature
when operated at 7.5 mA. These glass surface mount DO-213AA reference diodes are also
available in JAN, JANTX, JANTXV and JANS military qualifications. For commercial
applications it is also available as RoHS compliant (not applicable to military).
Available on
commercial
versions
Qualified Levels:
JAN, JANTX,
JANTXV and JANS
Important:
For the latest information, visit our website
http://www.microsemi.com.
FEATURES
•
•
•
•
•
•
•
Surface mount equivalent of JEDEC registered 1N935 through 1N938 number series.
Standard reference voltage of 9.0V +/- 5%.
Temperature compensated.
Internal metallurgical bond.
Double plug construction.
JAN, JANTX, JANTXV and JANS qualification are available per MIL-PRF-19500/156.
RoHS compliant versions available (commercial grade only).
DO-213AA MELF
Package
Also available in:
DO-35 (DO-204AH)
package
(axial-leaded)
1N935B-1 – 1N938B-1
APPLICATIONS / BENEFITS
•
•
•
•
•
Provides minimal voltage changes over a broad temperature range.
For instrumentation and other circuit designs requiring a stable voltage reference.
Maximum temperature coefficient selections available from 0.01 %/ºC to 0.001 %/ºC.
MELF surface mount.
Non-sensitive to ESD per MIL-STD-750 method 1020.
MAXIMUM RATINGS
@ T
A
= 25 ºC unless otherwise stated
Parameters/Test Conditions
Junction and Storage temperature
(1)
Power Dissipation
Maximum Zener Current
Solder Pad Temperatures at 10 s
Symbol
T
J
and T
STG
P
D
I
ZM
T
SP
Value
-65 to +175
500
50
260
Unit
o
C
mW
mA
o
C
MSC – Lawrence
6 Lake Street,
Lawrence, MA 01841
1-800-446-1158
Tel: (978) 620-2600
Fax: (978) 689-0803
MSC – Ireland
Gort Road Business Park,
Ennis, Co. Clare, Ireland
Tel: +353 (0) 65 6840044
Fax: +353 (0) 65 6822298
Website:
www.microsemi.com
Notes:
1. @ T
EC
= 50
o
C (see
figure 1).
For optimum voltage-temperature stability, I
Z
= 7.5 mA (less than 50 mW
in dissipated power). Derate at 3.33 mW/
o
C above T
A
= +25
o
C
.
T4-LDS-0158, Rev. 2 (121998)
©2013 Microsemi Corporation
Page 1 of 6
1N935BUR-1 – 1N938BUR-1
CDLL935 – CDLL938B
MECHANICAL and PACKAGING
•
•
•
•
•
•
•
•
CASE: Hermetically sealed glass case package.
TERMINALS: Tin/lead plated or RoHS compliant matte-tin (on commercial grade only) over copper clad steel. Solderable per
MIL-STD-750, method 2026.
POLARITY: Cathode end is banded.
MOUNTING: The axial coefficient of expansion (COE) of this device is approximately +6PPM/°C. The COE of the mounting
surface system should be selected to provide a suitable match with this device.
MARKING: Part number.
TAPE & REEL option: Standard per EIA-296. Consult factory for quantities.
WEIGHT: Approximately 0.04 grams.
See
Package Dimensions
on last page.
PART NOMENCLATURE
JAN 1N935 B
Reliability Level*
JAN = JAN Level
JANTX = JANTX Level
JANTXV = JANTXV Level
JANS = JANS Level
Blank = Commercial
*(available on “B” suffix only)
JEDEC type number
(see
Electrical Characteristics
table)
UR
-1
e3
RoHS Compliance
e3 = RoHS compliant (available
on commercial grade only)
Blank = non-RoHS compliant
Metallurgical Bond
MELF Surface Mount
Temperature Range
Blank = 0 to +75 ºC
A = -55 to +100 ºC
B = -55 to +150 ºC (required for
JAN level)
Symbol
I
ZM
I
Z
, I
ZT
, I
ZK
V
Z
Z
ZT
or Z
ZK
SYMBOLS & DEFINITIONS
Definition
Maximum Zener Current: The maximum rated dc current for the specified power rating.
Regulator Current: The dc regulator current (I
Z
), at a specified test point (I
ZT
), near breakdown knee (I
ZK
).
Zener Voltage: The Zener voltage the device will exhibit at a specified current (I
Z
) in its breakdown region.
Dynamic Impedance: The small signal impedance of the diode when biased to operate in its breakdown region at a
specified rms current modulation (typically 10% of I
ZT
or I
ZK
) and superimposed on I
ZT
or I
ZK
respectively.
T4-LDS-0158, Rev. 2 (121998)
©2013 Microsemi Corporation
Page 2 of 6
1N935BUR-1 – 1N938BUR-1
CDLL935 – CDLL938B
ELECTRICAL CHARACTERISTICS
@ 25 C unless otherwise specified
ZENER
VOLTAGE
V
Z
@ I
ZT
Volts
1N935BUR-1
CDLL935
CDLL935A
CDLL935B
CDLL936
CDLL936A
CDLL936B
1N937BUR-1
CDLL937
CDLL937A
CDLL937B
CDLL938
CDLL938A
CDLL938B
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
8.55 – 9.45
ZENER
TEST
CURRENT
I
ZT
mA
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.5
7.5
MAXIMUM
ZENER
IMPEDACE
(Note 2)
Z
ZT
Ohms
20
20
20
20
20
20
20
20
20
20
20
20
VOLTAGE
TEMPERATURE
STABILITY
∆V
ZT
MAXIMUM
(Note 3)
mV
67
139
184
34
70
92
13
28
37
6.7
13.9
19
TEMPERATURE
RANGE
EFFECTIVE
TEMPERATURE
COEFFICIENT
α
VZ
% / °C
0.01
0.01
0.01
0.005
0.005
0.005
0.002
0.002
0.002
0.001
0.001
0.001
o
MIL-PRF-
19500/156
MSC TYPE
NUMBER
(Note 1)
°C
0 to +75
-55 to +100
-55 to +150
0 to +75
-55 to +100
-55 to +150
0 to +75
-55 to +100
-55 to +150
0 to +75
-55 to +100
-55 to +150
1N938BUR-1
NOTE 1:
Microsemi CDLL prefixed numbers are commercial use only. For high-reliability applications JAN prefixed 1N numbers must be
selected along with the B suffix.
NOTE 2:
Zener impedance is derived by superimposing on I
ZT
A 60 Hz rms ac current equal to 10% of I
ZT
.
NOTE 3:
The maximum allowable change observed over the entire temperature range i.e., the diode voltage will not exceed the specified mV
at any discrete temperature between the established limits, per JEDEC standard No. 5.
T4-LDS-0158, Rev. 2 (121998)
©2013 Microsemi Corporation
Page 3 of 6
1N935BUR-1 – 1N938BUR-1
CDLL935 – CDLL938B
GRAPHS
Pd, Rated Power
Dissipation (mW)
T
EC
, End Cap Temperature (C°) 3/8” from body
FIGURE 1
Power Derating Curve
Zener Impedance Z
ZT
(Ohms)
Operating Current I
Z
(mA)
FIGURE 2
Zener Impedance vs. Operating Current
T4-LDS-0158, Rev. 2 (121998)
©2013 Microsemi Corporation
Page 4 of 6
1N935BUR-1 – 1N938BUR-1
CDLL935 – CDLL938B
GRAPHS
Change in Temperature Coefficient (%/°C)
Operating Current I
Z
(mA)
FIGURE 3
Typical Change of Temperature Coefficient with Change in Operating Current
T4-LDS-0158, Rev. 2 (121998)
©2013 Microsemi Corporation
Page 5 of 6
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